查询词典 parabolic curve

Surface topography;multi-scale surface;material probability curve;material ratio curve

表面形貌；多尺度表面；概率曲线；支承率曲线

In order to improve the security, a signature scheme based on two hard problem assumptions is proposed. The security of the scheme is based on the difficulties of simultaneously solving the elliptic curve and quadratic residue. A attacker can't forge the signature of messages even if a attacker can solve theelliptic curve discrete logarithm problems or quadratic residue problem in the scheme.

为了提高签名的安全性，本文对Wang等人提出的签名方案进行改进，提出了一个基于椭圆曲线离散对数问题和二次剩余问题的数字签名方案，并对该方案的安全性进行分析，指出在椭圆曲线离散对数问题或二次剩余问题可解的情况下，攻击者也无法伪造消息的签名。

In order to realize the transition from quartic Wang-Ball to Said-Ball curve, and the transition from quartic Said-Ball to B6zier curve, two new classes of curves with shape parameters are defined.

为了实现从四次Wang-Ball到Said-Ball曲线的过渡，以及从四次Said-Ball到B6zier曲线的过渡，定义了2种带形状参数的曲线。

On the one hand, we improve the mixed having and ternary method to express n from the standard non-singular elliptic curve with character 2. On the other hand, we improve the mixed binary and ternary method to express n from the standard elliptic curve with character more than 3 , and we generalize the mixed binary, ternary and quinary method to express n.

一方面从特征是2的有限域上的标准非奇异椭圆曲线的角度出发，改进了n的半点和三进制的形式；另一方面从特征大于3的有限域上的标准椭圆曲线的角度出发，改进了n的二进制和三进制的混合形式，并推广到n的二进制、三进制和五进制的混合形式。

Firstly, a quintic PH-spline curve is used to approximate a cubic Bézier curve within a bound. The convergence for the approximation is proved.

研究用C1连续的五次Pythagorean-Hodograph样条曲线逼近一给定的三次Bézier曲线，证明了这种逼近算法在常用误差测度下的收敛性。

Most of them have 1-3 slender,poorly ramified primarydendrites.(2)IGF-1 enhanced the amplitude of I_in DIV 7d NPY neurons and slightlyshifted the steady-state activation curve to negative potentials,however,the steady-stateinactivation curve was not altered.

结果：(1)NPY神经元在形态上具有明显特点，典型的NPY神经元细胞体较小，成三角形或纺锤形，大部分具有1-3个细小的、不分枝的一级树突。

This topic mainly makes full use of the theory of node curve in closed condition and theory of instantaneous transmission to ratiocinate the rolling curve equation of the ellipse in polar coordinates format.

推导了以极坐标表示的椭圆轧件楔横轧轧制曲线方程，为轧件成形提供了理论依据，扩展了非回转轧件轧制的范围。

If the progenitor is a rational curve, then its offset is usually not a rational curve except for special cases.

其在工程中得到广泛的使用，是近十年来CAD/CAM的研究热点之一。

The relationship between the transformation of weights on rational Bézier curve and parameterization of the curve with the shape unchanged is discussed.

研究了在曲线形状保持不变的条件下，有理n次Bézier曲线的权因子改变与曲线参数化的关系。

A quantitative description of variation of the demagnetization curve rectangularity of Nd-Fe-B magnets with sintering process and a study of the effect of relative density, grain size and its distribution on the demagnetization curve rectangularity of Nd-Fe-B magnets are presented in this paper.

定量描述了Nd-Fe-B磁体J-H 退磁曲线方形度与烧结过程的关系，分析了相对密度、晶粒尺寸及其分布对磁体J-H 退磁曲线方形度的影响规律。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。